Heat Stress? Anyone have knowlege on this ? Symptoms?

SeattleLights#1

Active Member
Just got a 400 hps for my lowryder 2 auto and the plant is blowing up its in the first week of flower (just showed sex 4 days ago) and its growing alot the whole plant is nice and green except 1 around the top a fan leaf has a dark green/brown spot about the size of a penny and the tips of the leaf and the tips of a few smaller leaves are also on the dark brown side not crispy but not healthy green like the rest of her. im growing in hydro and and my ph is good no ppm meter but ive used the same recipe last week with no burn so that would make me lean tward heat/light the temps are 80ish cuz its a heat wave hurr in seattle lol
 
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